class_docstr: Base class for a single training/dev/test example 
code: def __init__(self, guid: str, text, label=None):
      self.guid = guid
      self.text = text
      self.text_a = text  # for compatibility with trasformer library
      self.label = label
  
imports: from __future__ import absolute_import, division, print_function
  import csv
  import os
  import random
  import sys
  from abc import ABC
  from io import open
  from typing import List, Tuple
label_desc: Use image node_id 1 to create a new InputExample object from inherited base classes: ABC with example: obj = InputExample(guid, text, label)